Heat Exchange Flat Tube and Heat Exchanger

ABSTRACT

Some embodiments of the present disclosure provide a heat exchange flat tube and a heat exchanger. The heat exchange flat tube includes: a first plate body; a second plate body, which is disposed opposite to the first plate body, a fluid channel is formed between the second plate body and the first plate body, and the fluid channel is provided with an inlet and an outlet; a throttling structure is disposed between the first plate body and the second plate body, the throttling structure communicates with the fluid channel, the throttling structure is located at the inlet, and the throttling structure includes a plurality of bent sections which communicate in sequence.

CROSS-REFERENCE TO RELATED APPLICATION

The present disclosure claims priority to Chinese Patent Application No.202010567679.8, filed to the China National Intellectual PropertyAdministration on Jun. 19, 2020 and entitled “Heat Exchange Flat Tubeand Heat Exchanger”.

TECHNICAL FIELD

The present disclosure relates to a technical field of heat exchangerdevices, and in particular to a heat exchange flat tube and a heatexchanger.

BACKGROUND

At present, a fluid channel and a convex hull structure are disposed ina heat exchange flat tube in the art known to inventors, and a certainturbulent flow effect can be achieved on a fluid medium in the fluidchannel through the convex hull structure. Generally, an inlet part ofthe heat exchange flat tube is inserted into a flow collecting pipe toenable the fluid channel to communicate with the flow collecting pipe,and in the art known to inventors, the inlet part is mostly located atan end of the heat exchange flat tube and is of a hole-shaped structure.

However, in such a case, throttling at the inflow position is notfacilitated, and the throttling effect of the heat exchange flat tube ispoor.

SUMMARY

Some embodiments of the present disclosure provide a heat exchange flattube and a heat exchanger, so as to solve a technical problem that thethrottling effect of a heat exchange flat tube is poor in the art knownto inventors.

Some embodiments of the present disclosure provide a heat exchange flattube, which includes: a first plate body; a second plate body, which isdisposed opposite to the first plate body, a fluid channel is formedbetween the second plate body and the first plate body, and the fluidchannel is provided with an inlet and an outlet; a throttling structureis disposed between the first plate body and the second plate body, thethrottling structure communicates with the fluid channel, the throttlingstructure is located at the inlet, and the throttling structure includesa plurality of bent sections which communicate in sequence.

In some embodiments, the throttling structure includes a firstthrottling groove, which is formed in the first plate body.

In some embodiments, the first throttling groove includes a first groovesection, a first arc-shaped connecting section, a second groove sectionand a second arc-shaped connecting section which sequentiallycommunicate, a throttling opening of the first throttling groove isdisposed in an end, away from the first arc-shaped connecting section,of the first groove section, the second arc-shaped connecting section islocated at the inlet, and an end, away from the second groove section,of the second arc-shaped connecting section forms a flow outlet of thefirst throttling groove.

In some embodiments, the first plate body includes a first main plateand a first throttling plate, the first throttling plate is disposed atan end of the first main plate, and the first throttling groove isdisposed on the first throttling plate; the second plate body includes asecond main plate and a second throttling plate, the second throttlingplate is disposed at an end of the second main plate; and the secondmain plate and the first main plate are oppositely disposed, and thesecond throttling plate and the first throttling plate are oppositelydisposed, so that a first throttling channel is formed by the firstthrottling groove and the second throttling plate.

In some embodiments, the throttling opening of the first throttlinggroove is located on a side portion of the first main plate.

In some embodiments, a first bent part is disposed at a side portion ofthe first main plate, a second bent part is disposed at a side portionof the second main plate, the second bent part and the first bent partare oppositely disposed to form a clamping part, a clamping openingwhich is cooperated with the clamping part is disposed on a flowcollecting pipe, and the clamping part is clamped at the clampingopening to enable the first throttling groove to be inserted into theflow collecting pipe.

In some embodiments, the throttling structure further includes a secondthrottling groove, the second throttling groove is disposed on thesecond plate body, the second throttling groove is located in the inlet,the second throttling groove communicates with the fluid channel, andthe second throttling groove and the first throttling groove areoppositely disposed, so that a second throttling channel is formed bythe second throttling groove and the first throttling groove.

In some embodiments, a first preset angle is formed between acirculation direction of the flow outlet of the first throttling grooveand a circulation direction in the fluid channel; and/or a second presetangle is formed between a circulation direction of a flow outlet of thesecond throttling groove and the circulation direction in the fluidchannel.

In some embodiments, the fluid channel is a U-shaped channel, the inletand the outlet are located at the same end of the heat exchange flattube and disposed at an interval, and the throttling opening of thefirst throttling groove is disposed towards a side close to the inlet.

Some embodiments of the present disclosure disclose a heat exchanger,including a heat exchange flat tube, which is the heat exchange flattube provided above.

By adoption of the technical solution, the throttling structure isdisposed on the heat exchange flat tube, and the throttling structurecommunicates with the fluid channel, so that liquid can enter the fluidchannel after being throttled through the plurality of bent sections ofthe throttling structure, then throttling resistance can be increased,and the throttling effect can be better enhanced. Therefore, through thetechnical solution provided by the present disclosure, the technicalproblem that the throttling effect of a heat exchange flat tube in theart known to inventors is poor can be solved.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings forming a part of the application in the specification areadopted to provide a further understanding to the present disclosure.Some embodiments of the present disclosure are adopted to explain theapplication and not intended to form improper limits to the application.In the drawings:

FIG. 1 illustrates a schematic structure diagram of a first plate bodyprovided according to some embodiments of the present disclosure;

FIG. 2 illustrates a schematic structure diagram of a second plate bodyprovided with a second throttling groove provided according to someembodiments of the present disclosure;

FIG. 3 illustrates a schematic structure diagram of a second plate bodynot provided with a second throttling groove provided according to someembodiments of the present disclosure;

FIG. 4 illustrates a schematic structure diagram of a heat exchange flattube provided with a first throttling groove and a second throttlinggroove provided according to some embodiments of the present disclosure;

FIG. 5 illustrates an enlarged schematic diagram of A in FIG. 4 ;

FIG. 6 illustrates a schematic structure diagram of a heat exchange flattube provided with a first throttling groove provided according to someembodiments of the present disclosure;

FIG. 7 illustrates an enlarged schematic diagram of B in FIG. 6 ;

FIG. 8 illustrates schematic structure diagrams of a heat exchange flattube and a flow collecting pipe provided according to some embodimentsof the present disclosure;

FIG. 9 illustrates a schematic structure diagram of a heat exchangerprovided according to some embodiments of the present disclosure;

FIG. 10 illustrates a schematic structure diagram of a heat exchanger atanother angle provided according to some embodiments of the presentdisclosure;

FIG. 11 illustrates an enlarged schematic diagram of C in FIG. 10 .

FIG. 12 illustrates a schematic structure diagram of an exploded view ofa heat exchanger provided according to some embodiments of the presentdisclosure;

The above drawings include the following reference signs:

10, First plate body; 11, First throttling groove; 111, First groovesection; 112, First arc-shaped connecting section; 113, Second groovesection; 114, Second arc-shaped connecting section; 115, Throttlingopening; 12, First main plate; 121, First bent part; 13, Firstthrottling plate; 20, Second plate body; 21, Second main plate; 211,Second bent part; 22, Second throttling plate; 23, Second throttlinggroove; 30, Flow collecting pipe; 40, Fin; 50, Side plate; 60,Connecting pipe.

DETAILED DESCRIPTION OF THE EMBODIMENTS

It is to be noted that the embodiments and features in the embodimentsof the present disclosure may be combined with each other withoutconflict. The application will be described in detail below withreference to the accompanying drawings and the embodiments.

As shown in FIGS. 1-8 , Embodiment 1 of the present disclosure providesa heat exchange flat tube including a first plate body 10 and a secondplate body 20. The second plate body 20 and the first plate body 10 areoppositely disposed, specifically, the first plate body 10 and thesecond plate body 20 may be welded together, a fluid channel is formedbetween the second plate body 20 and the first plate body 10, and thefluid channel is provided with an inlet and an outlet. A throttlingstructure is disposed between the first plate body 10 and the secondplate body 20, the throttling structure communicates with the fluidchannel, the throttling structure is located at the inlet, and thethrottling structure includes a plurality of bent sections whichcommunicate in sequence.

By adoption of the heat exchange flat tube provided by the embodiment,the throttling structure is disposed on the heat exchange flat tube, andcommunicates with the fluid channel. Therefore, liquid entering the heatexchange flat tube is throttled through the plurality of bent sectionsof the throttling structure, and then the throttled liquid enters thefluid channel. By adoption of the arrangement, the throttling resistancecan be increased to improve the throttling effect, so that a refrigerantin a flow collecting pipe 30 can be mixed more fully and distributedmore uniformly to each heat exchange flat tube, and the heat exchangeflat tube in the embodiment is particularly suitable for being appliedto an evaporator. Therefore, through the heat exchange flat tubeprovided by the embodiment, the technical problem that the throttlingeffect of a heat exchange flat tube in the art known to inventors ispoor can be solved. Meanwhile, the situation that the throttlingstructure is too long in the length direction can be avoided through theplurality of bent sections, and then the situation that the overalllength of the heat exchange flat tube is excessively increased isavoided.

In some embodiments, the throttling structure includes a firstthrottling groove 11, which is disposed on the first plate body 10. Byadoption of the structural arrangement, liquid can be convenientlythrottled through the first throttling groove 11, the circulation areaof the first throttling groove 11 is far smaller than that in the fluidchannel, so that the throttling effect can be guaranteed.

In some embodiments, the first throttling groove 11 can be of astrip-shaped groove structure, and the first throttling groove 11 canalso be of an arc-shaped groove structure.

In some embodiments, the first throttling groove 11 includes a firstgroove section 111, a first arc-shaped connecting section 112, a secondgroove section 113 and a second arc-shaped connecting section 114 whichsequentially communicate, a throttling opening 115 of the firstthrottling groove 11 is disposed at the end, away from the firstarc-shaped connecting section 112, of the first groove section 111, thesecond arc-shaped connecting section 114 is located at the inlet, andthe end, away from the second groove section 113, of the secondarc-shaped connecting section 114 forms a flow outlet of the firstthrottling groove 11. The throttling opening 115 of the first throttlinggroove 11 forms a flow inlet of the heat exchange flat tube, and liquidenters the first throttling groove 11 from the throttling opening 115 toachieve throttling.

In some embodiments, the first groove section 111, the first arc-shapedconnecting section 112, the second groove section 113 and the secondarc-shaped connecting section 114 form an S-like structure, so that theeffective throttling length of the throttling structure can be ensuredunder the condition that the overall length of the heat exchange flattube is not increased, and the throttling effect can be improved.Meanwhile, the first arc-shaped connecting section 112 and the secondarc-shaped connecting section 114 are disposed, so that the situationthat liquid flows unsmoothly at a bent position can be avoided, andliquid can smoothly flow into the fluid channel.

In some embodiments, the first plate body 10 includes a first main plate12 and a first throttling plate 13, the first throttling plate 13 isdisposed at the end of the first main plate 12, and the first throttlinggroove 11 is disposed on the first throttling plate 13. The second platebody 20 includes a second main plate 21 and a second throttling plate22, and the second throttling plate 22 is disposed at the end of thesecond main plate 21. The second main plate 21 and the first main plate12 are oppositely disposed, and the second throttling plate 22 and thefirst throttling plate 13 are oppositely disposed, so that the firstthrottling groove 11 and the second throttling plate 22 form a firstthrottling channel.

In some embodiments, the second throttling plate 22 here is of a flatplate structure, and a circulation face of the first throttling channelformed is of a semi-circulation cross-sectional structure.

In some embodiments, the throttling opening 115 of the first throttlinggroove 11 is located on the side portion of the first main plate 12. Insome embodiments, the first throttling plate 13 is a plate with anarc-shaped protrusion, the shape of the second throttling plate 22 isthe same as that of the first throttling plate 13, the throttle opening115 of the first throttling groove 11 is located at the position of thearc-shaped protrusion of the first throttling plate 13, and thethrottling opening 115 of the first throttling groove 11 is located onthe side portion of the arc-shaped protrusion. By adoption of thestructural arrangement, the position of the first throttling groove 11can conform to the structural shapes of the first throttling plate 13and the second throttling plate 22.

In some embodiments, a first bent part 121 is disposed at the sideportion of the first main plate 12, a second bent part 211 is disposedat the side portion of the second main plate 21, the second bent part211 and the first bent part 121 are oppositely disposed to form aclamping part, a clamping opening which is cooperated with the clampingpart is disposed on the flow collecting pipe 30, and the clamping partis clamped at the clamping opening to enable the first throttling groove11 to be inserted into the flow collecting pipe 30. The first bent part121 is provided with a first bent opening and a second bent openingwhich are oppositely disposed, and the first bent opening and the secondbent opening are oppositely located in two sides of the first main plate12; and the second bent part 211 is provided with a third bent openingand a fourth bent opening which are oppositely disposed, and the thirdbent opening and the fourth bent opening are oppositely located on twosides of the second main plate 21. In some embodiments, in order tofacilitate clamping, the structure of the first bent part 121 is thesame as the structure of the second bent part 211. By adopting thestructural arrangement, the heat exchange flat tube can be convenientlyconnected with the flow collecting pipe 30, so that the stability of thestructural arrangement is improved.

In some embodiments, the throttling structure further includes a secondthrottling groove 23, the second throttling groove 23 is disposed on thesecond plate body 20, the second throttling groove 23 is located in theinlet, the second throttling groove 23 communicates with the fluidchannel, and the second throttling groove 23 and the first throttlinggroove 11 are oppositely disposed, so that a second throttling channelis formed by the second throttling groove 23 and the first throttlinggroove 11. Compared with the first throttling channel, the circulationarea of the second throttling channel is increased, namely, thethrottling area is increased, and a circulation face of the secondthrottling channel may be a full-circulation cross section. By adoptionof the structural arrangement, the throttling effect can be improved, arefrigerant can be mixed more fully, so that the refrigerant can bedistributed into each heat exchange flat tube more uniformly.

In some embodiments, the structure of the first throttling groove 11 andthe structure of the second throttling groove 23 can be completely thesame, or the structure of the first throttling groove 11 and thestructure of the second throttling groove 23 can be different as long asat least part of the first throttling groove 11 and at least part of thesecond throttling groove 23 communicate to form the second throttlingchannel.

In some embodiments, the structure of the second plate body 20 here isthe same as that of the first plate body 10, the second throttlinggroove 23 is disposed on the second throttling plate 22, and both thefirst throttling plate 13 and the second throttling plate 22 aredisposed on the flow collecting pipe 30 in use, so that pre-throttlingis achieved in the flow collecting pipe 30 by the first throttling plate13 and the second throttling plate 22 to better improve the throttlingeffect.

In some embodiments, a first preset angle is formed between thecirculation direction of the flow outlet of the first throttling groove11 and the circulation direction in the fluid channel; and a secondpreset angle is formed between the circulation direction of the flowoutlet of the second throttling groove 23 and the circulation directionin the fluid channel. By adoption of the structural arrangement, arefrigerant in the first throttling groove 11 and the second throttlinggroove 23 can conveniently flow into the fluid channel. The circulationdirection of the flow channel extend in the extending direction of theplate body, and due to the fact that the throttling structure isprovided with the plurality of oppositely disposed bent sections, theflow outlet deviates from the center line of the main plate body, thatis, the flow outlet is disposed at the end of the main plate body, andthe flow outlet is disposed at the position close to the side portion.In such a case, if the circulation direction of the flow outlet of thefirst throttling groove 11 is consistent with the direction in the fluidchannel, and the circulation direction of the flow outlet of the secondthrottling groove 23 is also consistent with the direction in the fluidchannel, liquid throttled by the throttling structure cannot be fullyand uniformly supplemented to each part of the fluid channel, therefrigerant cannot be uniformly distributed to each part of the fluidchannel, and better heat exchange of the refrigerant is not facilitated.A first preset angle is formed between the circulation direction of theflow outlet of the first throttling groove 11 and the circulationdirection in the fluid channel, and a second preset angle is formedbetween the circulation direction of the flow outlet of the secondthrottling groove 23 and the circulation direction in the fluid channel,due to the inclined structure, the refrigerant can enter the fluidchannel at a certain angle, so that the refrigerant can be fully filledinto the fluid channel, the distribution uniformity of the refrigerantis improved, and the heat exchange effect is improved.

In some embodiments, a plurality of turbulent flow convex hulls whichare arranged at intervals are disposed in the fluid channel, and theturbulent flow convex hulls can play a turbulent flow role on therefrigerant in the fluid channel, so that heat exchange can be betterperformed.

In some embodiments, the fluid channel is a U-shaped channel, the inletand the outlet are disposed at the same end of the heat exchange flattube and disposed at an interval, and the throttling opening 115 of thefirst throttling groove 11 is disposed towards the side close to theinlet. By adoption of the structure arrangement, the compactness of thestructure arrangement can be improved, and the structure layout can beoptimized.

In some embodiments, the first throttling groove 11 protrudes out of theoutlet, so that the first throttling groove 11 can stretch into the flowcollecting pipe 30, the first throttling groove 11 can conductpre-throttling on the refrigerant in the collecting pipe 30, and thethrottling effect is improved.

As shown in FIGS. 9-12 , In some embodiments of the present disclosureprovides a heat exchanger, including a heat exchange flat tube, which isheat exchange flat tube provided by the above embodiments. The heatexchanger further includes a flow collecting pipe 30, a fin 40, a sideplate 50 and a connecting pipe 60, the flow collecting pipe 30 isconnected with the heat exchange flat tube so that the flow collectingpipe 30 can communicate with the fluid channel. The fin 40 is disposedon the heat exchange flat tube, the side plate 50 is disposed on the endof the heat exchange flat tube, and the connecting pipe 60 is disposedon the flow collecting pipe 30 so that connecting with other pieces tobe connected can be realized through the connecting pipe 60.

From the above description, it can be seen that the above embodiment ofthe application achieves the following technical effects: the throttlingresistance is increased, the throttling effect is enhanced, and therefrigerant in the flow collecting pipe is more fully mixed and moreuniformly distributed into each heat exchange flat tube.

It is to be noted that terms used herein are for the purpose ofdescribing specific implementation modes only and are not intended to belimiting of exemplary implementation modes according to the application.Unless otherwise directed by the context, singular forms of terms usedherein are intended to include plural forms. Besides, it will be alsoappreciated that when terms “contain” and/or “include” are used in thedescription, it is indicated that features, steps, operations, devices,assemblies and/or a combination thereof exist.

Unless otherwise specified, relative arrangements of components andsteps elaborated in these embodiments, numeric expressions and numericvalues do not limit the scope of the application. Furthermore, it shouldbe understood that for ease of descriptions, the size of each part shownin the drawings is not drawn in accordance with an actual proportionalrelation. Technologies, methods and devices known by those of ordinaryskill in the related art may not be discussed in detail. However, whereappropriate, the technologies, the methods and the devices shall beregarded as part of the authorized description. In all examples shownand discussed herein, any specific values shall be interpreted as onlyexemplar values instead of limited values. Therefore, other examples ofthe exemplary embodiments may have different values. It is to be notedthat similar marks and letters represent similar items in the followingdrawings. As a result, once a certain item is defined in one drawing, itis unnecessary to further discus the certain item in the subsequentdrawings.

In the descriptions of the application, it will be appreciated thatlocative or positional relations indicated by “front, back, up, down,left, and right”, “horizontal, vertical, perpendicular, and horizontal”,“top and bottom” and other terms are locative or positional relationsshown on the basis of the drawings, which are only intended to make itconvenient to describe the application and to simplify the descriptionswithout indicating or impliedly indicating that the referring device orelement must have a specific location and must be constructed andoperated with the specific location, and accordingly it cannot beunderstood as limitations to the application. The nouns of locality“inner and outer” refer to the inner and outer contours of eachcomponent.

For ease of description, spatial relative terms such as “over”, “above”,“on an upper surface” and “upper” may be used herein for describing aspatial position relation between a device or feature and other devicesor features shown in the drawings. It will be appreciated that thespatial relative terms aim to contain different orientations in usage oroperation besides the orientations of the devices described in thedrawings. For example, if the devices in the drawings are inverted,devices described as “above other devices or structures” or “over otherdevices or structures” will be located as “below other devices orstructures” or “under other devices or structures”. Thus, an exemplarterm “above” may include two orientations namely “above” and “below”.The device may be located in other different modes (rotated by 90degrees or located in other orientations), and spatial relativedescriptions used herein are correspondingly explained.

In addition, it is to be noted that terms “first”, “second” and the likeare used to limit parts, and are only intended to distinguishcorresponding parts. If there are no otherwise statements, the aboveterms do not have special meanings, such that they cannot be understoodas limits to the scope of protection of the application.

The above is only the preferred embodiment of the application and notintended to limit the application. For those skilled in the art, theapplication may have various modifications and variations. Anymodifications, equivalent replacements, improvements and the like madewithin the spirit and principle of the application shall fall within thescope of protection of the application.

1. A heat exchange flat tube, comprising: a first plate body; a secondplate body, which is disposed opposite to the first plate body, a fluidchannel is formed between the second plate body and the first platebody, and the fluid channel is provided with an inlet and an outlet; anda throttling structure, which is disposed between the first plate bodyand the second plate body, wherein the throttling structure communicateswith the fluid channel, the throttling structure is located at theinlet, and the throttling structure comprises a plurality of bentsections which communicate in sequence.
 2. The heat exchange flat tubeas claimed in claim 1, wherein the throttling structure comprises afirst throttling groove, and the first throttling groove is disposed onthe first plate body.
 3. The heat exchange flat tube as claimed in claim2, wherein the first throttling groove comprises a first groove section,a first arc-shaped connecting section, a second groove section and asecond arc-shaped connecting section which sequentially communicate, athrottling opening of the first throttling groove is disposed at an end,away from the first arc-shaped connecting section, of the first groovesection, the second arc-shaped connecting section is located at theinlet, and an end, away from the second groove section, the secondarc-shaped connecting section is provided with a flow outlet of thefirst throttling groove.
 4. The heat exchange flat tube as claimed inclaim 2, wherein the first plate body comprises a first main plate and afirst throttling plate, the first throttling plate is disposed at an endof the first main plate, and the first throttling groove is disposed onthe first throttling plate; the second plate body comprises a secondmain plate and a second throttling plate, and the second throttlingplate is disposed at an end of the second main plate; wherein the secondmain plate and the first main plate are oppositely disposed, and thesecond throttling plate and the first throttling plate are oppositelydisposed, so that a first throttling channel is formed by the firstthrottling groove and the second throttling plate.
 5. The heat exchangeflat tube as claimed in claim 4, wherein the first throttling opening ofthe first throttling groove is located on a side portion of the firstmain plate.
 6. The heat exchange flat tube as claimed in claim 4,wherein a first bent part is disposed at a side portion of the firstmain plate, a second bent part is disposed at a side portion of thesecond main plate, the second bent part and the first bent part areoppositely disposed to form a clamping part, a clamping opening which iscooperated with the clamping part is disposed on a flow collecting pipe,and the clamping part is clamped at the clamping opening to enable thefirst throttling groove to be inserted into the flow collecting pipe. 7.The heat exchange flat tube as claimed in claim 2, wherein thethrottling structure further comprises a second throttling groove, thesecond throttling groove is disposed on the second plate body, thesecond throttling groove is located in the inlet, the second throttlinggroove communicates with the fluid channel, and the second throttlinggroove and the first throttling groove are oppositely disposed, so thata second throttling channel is formed by the second throttling grooveand the first throttling groove.
 8. The heat exchange flat tube asclaimed in claim 7, wherein a first preset angle is formed between acirculation direction of the flow outlet of the first throttling grooveand a circulation direction in the fluid channel; and a second presetangle is formed between a circulation direction of a flow outlet of thesecond throttling groove and the circulation direction in the fluidchannel.
 9. The heat exchange flat tube as claimed in claim 2, whereinthe fluid channel is a U-shaped channel, the inlet and the outlet arelocated at the same end of the heat exchange flat tube and disposed atan interval, and the throttling opening of the first throttling grooveis disposed towards a side close to the inlet.
 10. A heat exchanger,comprising a heat exchange flat tube, which is the heat exchange flattube as claimed in claim
 1. 11. The heat exchange flat tube as claimedin claim 3, wherein the throttling structure further comprises a secondthrottling groove, the second throttling groove is disposed on thesecond plate body, the second throttling groove is located in the inlet,the second throttling groove communicates with the fluid channel, andthe second throttling groove and the first throttling groove areoppositely disposed, so that a second throttling channel is formed bythe second throttling groove and the first throttling groove.
 12. Theheat exchange flat tube as claimed in claim 4, wherein the throttlingstructure further comprises a second throttling groove, the secondthrottling groove is disposed on the second plate body, the secondthrottling groove is located in the inlet, the second throttling groovecommunicates with the fluid channel, and the second throttling grooveand the first throttling groove are oppositely disposed, so that asecond throttling channel is formed by the second throttling groove andthe first throttling groove.
 13. The heat exchange flat tube as claimedin claim 3, wherein the fluid channel is a U-shaped channel, the inletand the outlet are located at the same end of the heat exchange flattube and disposed at an interval, and the throttling opening of thefirst throttling groove is disposed towards a side close to the inlet.14. The heat exchange flat tube as claimed in claim 4, wherein the fluidchannel is a U-shaped channel, the inlet and the outlet are located atthe same end of the heat exchange flat tube and disposed at an interval,and the throttling opening of the first throttling groove is disposedtowards a side close to the inlet.
 15. The heat exchange flat tube asclaimed in claim 6, wherein the fluid channel is a U-shaped channel, theinlet and the outlet are located at the same end of the heat exchangeflat tube and disposed at an interval, and the throttling opening of thefirst throttling groove is disposed towards a side close to the inlet.16. The heat exchanger as claimed in claim 10, wherein the throttlingstructure comprises a first throttling groove, and the first throttlinggroove is disposed on the first plate body.
 17. The heat exchanger asclaimed in claim 16, wherein the first throttling groove comprises afirst groove section, a first arc-shaped connecting section, a secondgroove section and a second arc-shaped connecting section whichsequentially communicate, a throttling opening of the first throttlinggroove is disposed at an end, away from the first arc-shaped connectingsection, of the first groove section, the second arc-shaped connectingsection is located at the inlet, and an end, away from the second groovesection, of the second arc-shaped connecting section is provided with aflow outlet of the first throttling groove.
 18. The heat exchanger asclaimed in claim 16, wherein the first plate body comprises a first mainplate and a first throttling plate, the first throttling plate isdisposed at an end of the first main plate, and the first throttlinggroove is disposed on the first throttling plate; the second plate bodycomprises a second main plate and a second throttling plate, and thesecond throttling plate is disposed at an end of the second main plate;wherein the second main plate and the first main plate are oppositelydisposed, and the second throttling plate and the first throttling plateare oppositely disposed, so that a first throttling channel is formed bythe first throttling groove and the second throttling plate.
 19. Theheat exchanger as claimed in claim 18, wherein a first bent part isdisposed at a side portion of the first main plate, a second bent partis disposed at a side portion of the second main plate, the second bentpart and the first bent part are oppositely disposed to form a clampingpart, a clamping opening which is cooperated with the clamping part isdisposed on a flow collecting pipe, and the clamping part is clamped atthe clamping opening to enable the first throttling groove to beinserted into the flow collecting pipe.
 20. The heat exchanger asclaimed in claim 16, wherein the throttling structure further comprisesa second throttling groove, the second throttling groove is disposed onthe second plate body, the second throttling groove is located in theinlet, the second throttling groove communicates with the fluid channel,and the second throttling groove and the first throttling groove areoppositely disposed, so that a second throttling channel is formed bythe second throttling groove and the first throttling groove.